The moment has left many asking where the little princesses adorable outfit was from and the answer is one of her mum, the Duchess of Cambridge's, close friends.

The cute blue smock dress is from British brand Little Alice London and costs £45. It's already sold out, but it's no surprise after foot age of the young Royal waving to the cameras outside the central London hospital went viral.

According to The Telegraph, Little Alice London owner Alice Avenel is a school friend of Kate from her time at Marlborough College and the Duke and Duchess of Cambridge both attended her wedding.

The brand boasts that many of their products are totally unique and all hand smocked which would explain the more expensive price tag.

If you didn't manage to bag one of the dresses before it sold out then fear not, George at ASDA are selling their own version for a fraction of the price - £4! And you can buy the matching cardigan for £6.

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